ThemeDIY creates, and modifies CM12 themes from within your device, without the need of a PC. You can customize many different aspects of themes, such as colors, wallpapers, lockscreen backgrounds, fonts, and boot animations.

Requires a device that runs Android Lollipop (5.X) with CM12 themes support (root might be needed for some secondary features). It also supports CM13 (Android 6)

Features:
-User-friendly UI
-One-click customizations ("Generate colors from wallpaper")
-Automatically install themes once made (requires root)
-Per-app modifications
-Wallpapers, lockscreen backgrounds, softkeys, TTF and OTF fonts, and boot animations
-Import ThemeDIY compatible themes and use them as templates
-Not just pre-defined colors, pick your own (HEX colors input)

Guide on how to use themeDIY:
http://darkion.net/news/how_to_use_cm12_theme_diy/2015-01-28-81

Special thanks to Miroslaw Stanek for his InstaMaterial app, and for Google Android Developers for code snippets

Found a bug? Contact the dev and it will be resolved as soon as possible. Don't forget to join ThemeDIY Google+ community for updates https://plus.google.com/u/0/communities/108487614858895543145